High dielectric VDF/TrFE/CTFE terpolymers prepared by hydrogenation of VDF/CTFE copolymers: Synthesis and characterization
Title of Paper:
High dielectric VDF/TrFE/CTFE terpolymers prepared by hydrogenation of VDF/CTFE copolymers: Synthesis and characterization
Summary:
This paper discusses a new chemical route involving VDF/CTFE copolymerization and partial hydrogena-
tion of CTFE units to prepare VDF/TrFE/CTFE terpolymers that exhibit several common features of a typical relaxor ferroelectric behavior, such as a diffuse phase transition, high dielectric constant at ambient temperature, and dielectric relaxation (large frequency dependence). In addition, we also observed the similar bulky CTFE effect in the VDF/TrFE/CTFE terpolymer, with the reduction of melting and Curie temperatures (relative to the thickness of ferroelectric crystalline domains). However, the microstructure of this terpolymer with a head-to-head VDF-TrFE sequence is very different from that of a head-to-tail VDF-TrFE sequence in the corresponding terpolymer prepared by direct terpolymerization. Consequently, the dielectric constant and Curie temperature vs terpolymer com-position are very different. The overall dielectric constant is
significantly reduced in the current terpolymer.
Co-author:
Zhiming Wang; Zhicheng Zhang; T. C. Mike Chung
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